|Publication number||US7455190 B2|
|Application number||US 10/989,532|
|Publication date||Nov 25, 2008|
|Filing date||Nov 15, 2004|
|Priority date||Nov 15, 2004|
|Also published as||DE102005054179A1, US20060102634|
|Publication number||10989532, 989532, US 7455190 B2, US 7455190B2, US-B2-7455190, US7455190 B2, US7455190B2|
|Inventors||James F. Potter, Cory Borghi|
|Original Assignee||Automotive Components Holdings, Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Referenced by (39), Classifications (12), Legal Events (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to fuel tank systems having enhanced durability and reduced permeation.
Fluid tanks are common in several industries. For example, fuel tanks for motorized vehicles have been used for many years. Many of the current fuel tanks installed in motorized vehicles are made of plastic or metal. Plastic storage containers provide a number of advantages over those made of other materials. Some advantages include reduced weight, reduced cost for both materials and construction, and greater flexibility and shape. Along with these advantages, the ability of certain plastic containers to stretch or flex makes them useful in automotive applications. A problem in plastic tanks that manufacturers have experienced is that fuel may permeate through the walls of the plastic tank.
Several approaches have been taken to reduce permeation through the fuel tanks and increase support or stability of the fuel tank systems. One solution to this problem has been to internalize components in the fuel tank due to the potential likelihood of leakage of fuel vapors through the components. However, manufacturers have been challenged in internalizing such components while maintaining support to the fuel tank and limiting movement of the internalized components in the fuel tank. Manufacturers have also been challenged in providing support within the fuel tank in view of pressure and vacuum forces therein. Additionally, manufacturers are further challenged in positioning the internalized components within fuel tanks.
The present invention provides a fluid tank system having enhanced durability and reduced permeation features. The system comprises a fuel tank including an internalized fuel system components, e.g., and a mounting apparatus. The mounting apparatus provides added support to the fuel tank and positively positions components therein for limited movement in the fuel tank.
In one embodiment, the present invention provides a fluid tank system having enhanced durability and reduced permeation. The fluid tank system comprises a fuel tank having first and second outer portions. The system further comprises a support portion having a body and first and second ends. The first end has a flange configured to engage the first outer portion of the fuel tank for providing support to the system. The second end has a reduced cross-sectional portion configured to engage the second outer portion of the fuel tank for limited movement from pressure and vacuum forces. The system further comprises a valve retainer arm having an attachment end attached to the support portion. The attachment end extends to a valve retainer end for retaining the internalized fuel system components within the fuel tank.
In another embodiment, the present invention provides a mounting apparatus for an internalized fuel system of a fuel tank. The apparatus comprises the support portion and the valve retainer arm.
In yet another embodiment, the present invention provides a method of manufacturing a fluid tank system having a supported internalized fuel system. The method comprises providing the mounting assembly of the fuel tank and extruding at least first and second outer portions of the fuel tank about the mounting assembly. The method further comprises molding the first and second outer portions of the fuel tank about the mounting assembly such that the first end of the mounting stem edges the first outer portion. The second end of the mounting stem engages the second outer portion of the fuel tank.
Further objects, features, and advantages of the present invention will become apparent from consideration of the following description and the appended claims when taken in connection with the accompanying drawings.
The present invention generally provides enhanced support to a fluid tank system and localized positive positioning of internalized components within the fluid tank system. Embodiments of the present invention provide enhanced support to a fuel tank of the system by incorporating a mounting assembly that is configured to be disposed between inner walls of the fuel tank. The mounting assembly provides added support to the fuel tank and to internalized fuel tank components, such as internal vapor valves, by attaching to opposing inner walls of the fuel tank. Moreover, the placement of the mounting assembly within the fuel tank provides enhanced accuracy or positive placement for internalized components within the fuel tank. Furthermore, the mounting assembly includes a safety feature that minimizes damage to the system at threshold pressure and low vacuum conditions within the fuel tank.
It is to be understood that fuel tank 12 may be made of any suitable moldable material such as polymeric material, e.g., high density polyethylene (HDPE) or polypropylene. Moreover, the fuel tank may merely include a single layer or may be multi-layered as desired for reduced permeation as describe in U.S. Pat. No. 6,722,521, issued Apr. 20, 2004 and entitled “LOW PERMEATION PINCHOFF CONNECTION FOR BRIDGING A BARRIER LAYER AND METHOD OF MAKING SAME,” which is hereby incorporated herein.
For example, the fuel tank may be comprised of a multi-layered wall including layers of polyethylene and an ethylene-vinyl alcohol (EVOH) co-polymer. In this example, the multi-layer wall may be a polyethylene-EVOH wall having a continuous inner polymeric layer, a continuous outer polymeric layer, and an EVOH copolymer layer disposed between the inner and outer polymeric layers. In this example, the continuous inner polymeric layer may be made of high density polyethylene (HDPE) and may also include carbon black compounded with the HDPE therein. Of course, the continuous inner polymeric layer may be made of any other suitable materials known in the art. Moreover, the outer polymeric layer may be placed in overlying relationship with the continuous inner polymeric layer. In this example, the outer polymeric layer is may be made of HDPE and may also include carbon black compounded with the HDPE therein. Of course, the outer polymeric layer may be made of any other suitable materials.
Fuel tank 12 may be formed using extrusion apparatus, twin-sheet thermo-forming, or blow molding techniques. Of course, other suitable ways in forming fluid tank may be used without falling beyond the scope or spirit of the present invention.
As shown in
As shown in
As mentioned above, the reduced cross-sectional portion 42 is configured to disengage from the second inner wall 22 at a predetermined threshold pressure placed on the fuel tank 12 from pressure and vacuum forces. In this embodiment, the legs 44 are configured to disengage or detach from the second end 36 of the support portion 32 when the threshold pressure or vacuum is reached. Preferably, the predetermined threshold pressure may range, but is not limited to between about 2 and 10 pounds per square inch gauge. The predetermined vacuum may range, but is not limited to between about 0 and −5 pounds per square inch gauge. In use, further potential damage to the fluid tank system 10 are avoided when threshold pressure and vacuum levels are reached in the fuel tank 12. Rather, potential damage and leakage may be safely maintained and isolated within the fuel tank 12 only.
In this embodiment, the mounting apparatus 30 of the system further comprises a valve retainer arm 46 having an attachment end 48 attached about the body 33 of the support portion 32. The attachment end 46 extends to a valve retainer end 50 for retaining internalized fuel system components, e.g., a vapor valve assembly 54, within the fuel tank 12. Preferably, the attachment end 48 of the valve retainer arm 46 has an attachment bore 52 formed therethrough and is attached about the body 33 of the support portion 32. As shown, one of the internalized fuel system components may include a vapor valve assembly 54 for regulating vapor pressure in the fuel tank 12. In this embodiment, the valve retainer end 50 has a holding portion, e.g. a holding cup, formed thereon to hold the vapor valve assembly 54 adjacent the first inner wall 20.
The valve retainer arm 46 may take on any suitable shape of configuration. For example, the valve retainer arm 46 may be larger that shown in the drawings and perforated to provide a slosh reduction baffle, reducing fuel slosh in the fuel tank during vehicle use.
In another embodiment, the valve retainer arm 46 may be placed adjacent to the bottom of the tank. In this embodiment, the valve retainer arm may hold the fuel pump, the fuel level indication device, and/or a fuel retention reservoir.
It should be noted that the valve retainer end 50 may be designed to provide a baffle protection configuration to vapor valve assembly. The baffle protections configuration would help reduce the exposure to liquid fuel and thereby reduce the chance of liquid entering valve assembly. Additionally, the vapor valve assembly 54 may be any suitable valve, e.g., a vapor grade vent valve or a fill limit vapor valve.
It is to be noted that the mounting apparatus 30 may be configured such that the valve retainer arm is in a position during molding and is subsequently moved by rotating or sliding into position after the tank is molded. This may be accomplished by any suitable means such as by reaching in the tank through the bore to move the arm.
In this example, first and second top mold sections 220, 222 and first and second bottom mold sections 224, 226 are then implemented to mold a portion of the parison 214 into a predetermined shape of the fuel tank 12 as desired in box 116. This may be accomplished by moving the first and second top molding sections 220, 222 together to a first closed position, trapping the mounting assembly within the first and second outer portions 14, 16 of the fuel tank 12. Thus, in this example, the first end 34 of each support portion 32 engages the first mounting portion 26 of the first inner wall 20 and the second end 36 of each support portion 32 engages the second mounting portion 28 of the second inner wall 22.
The holding fixture 212 is then removed from the open bottom of the parison. The first and second bottom molding sections 224, 226 are moved together to a second closed position, trapping the mounting assembly in the fuel tank 12, to mold the remainder of the fuel tank 12.
In use, the fluid tank system included enhanced support with a safety release feature and contains internalized components that are positively positions therein. The enhanced support feature provides added rigidity or stability to the fuel tank without compromising safety. Furthermore, internalized components are able to be accurately positioned within the fuel tank with limited movement therein.
While the present invention has been described in terms of preferred embodiments, it will be understood, of course, that the invention is not limited thereto since modifications may be made to those skilled in the art, particularly in light of the foregoing teachings.
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|U.S. Classification||220/4.14, 220/4.12, 220/653, 220/562|
|International Classification||B65D6/00, B65D8/04|
|Cooperative Classification||B60K2015/03059, B60K15/03177, B60K2015/03453, B60K15/073|
|European Classification||B60K15/073, B60K15/03P|
|Nov 15, 2004||AS||Assignment|
Owner name: VISTEON GLOBAL TECHNOLOGIES, INC., MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:POTTER, JAMES F.;BORGHI, CORY;REEL/FRAME:016002/0136
Effective date: 20041115
|Dec 1, 2005||AS||Assignment|
Owner name: AUTOMOTIVE COMPONENTS HOLDINGS, LLC, MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VISTEON GLOBAL TECHNOLOGIES, INC.;REEL/FRAME:016835/0448
Effective date: 20051129
|Feb 15, 2006||AS||Assignment|
Owner name: FORD MOTOR COMPANY, MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AUTOMOTIVE COMPONENTS HOLDINGS, LLC;REEL/FRAME:017164/0694
Effective date: 20060214
|Mar 21, 2007||AS||Assignment|
Owner name: AUTOMOTIVE COMPONENTS HOLDINGS, LLC, MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FORD MOTOR COMPANY;REEL/FRAME:019040/0979
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|Apr 20, 2009||AS||Assignment|
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FORD MOTOR COMPANY;REEL/FRAME:022562/0494
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|Apr 25, 2012||FPAY||Fee payment|
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|Oct 2, 2013||AS||Assignment|
Owner name: INERGY AUTOMOTIVE SYSTEMS RESEARCH (SA), BELGIUM
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